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Bank segment - Other borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Gross amount  of recognized  liabilities	$ 129	$ 90
Gross amount  offset in the  Balance Sheets	0	0
Net amount of liabilities presented in the Balance Sheets	129	90
Commercial account holders
Offsetting Liabilities [Line Items]
Net amount of liabilities presented in the Balance Sheets	129	90
Financial instruments	146	92
Cash collateral pledged	$ 0	$ 0

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